Hydraulic mechanism



March 24, 1953 w, MA 2,632,400

HYDRAULIC MECHANISM Filed March 23, 1949 4 Sheets-Sheet l W VEN TORWalter H Marsh F 6 Arlorn eys March 1953 w. H. MARSH 2,632,400

' HYDRAULIC MECHANISM Filed March 23, I949 4 Sheets-Sheet 2 //v VEN TORWalter H. Marsh 5, ,mmz

A ffameys March 24, 1953 w. H. MARSH 2,632,400

HYDRAULIC MECHANISM Filed March 23, 1949 4 Sheets-Sheet 3 figs 94 //vVEN 70/ Walter H. Marsh 98 k Attorneys 6 i/MJ/ Mag-ch 24, 1953 w. H.MARSH I 2,532,400

' HYDRAULIC MECHANISM Filed March 25, 1949 4 Sheets-Sheet 4 //v VE/V70/? Walter H. Marsh By /M wwaw A r for/1e ys Patented Mar. 24, 1953HYDRAULIC MECHANISM Walter H. Marsh, Grafton, Pa., assignor to RockwellManufacturing Company, Pittsburgh, Pa., a corporation of PennsylvaniaApplication March 23, 1949, Serial No. 82,940

This invention relates to hydraulic apparatus or" the rotary type whichmay be used either as a motor or a pump and has for its general objectand purpose to provide a simplified mechanism of this kind, the severalparts of which may be quickly and accurately assembled within an outercasing for eflicient and reliable operation.

It is a more particular object of the invention to provide an improvedrotor with an improved mounting of rotor vanes therein, together with acooperating division plate for pre-assembly with the rotor and insertiontherewith between the inlet and outlet ports in the wall of a workingchamber.

Another object of the invention is to provide a double-acting hydraulicpump or motor having division plates spaced 180 degrees apart betweeninlet and outlet ports in a liner sleeve, together with operatinggearing for the rotor vanes and means for accurately timing the rotationof the vanes by said gearing relative to the rotor so that the vaneswill safely pass over the division plates without interference.

It is a further object of the invention to provide a novel rotor andchamber ring construction which facilitates the accurate assembly of thevanes therein and permits the use of large size bearings ofsubstantially equal diameter to the vane.

An additional object of the invention resides in the provision of anannular peripheral fluid receiving chamber in the rotor intersecting thevane openings together with a novel sectional ring and division plateassembly in said chamber slidably keyed to the liner sleeve for axialmovement with the rotor, and having a face to face sealing relation tothe opposite side walls of said chamber.

With the above and other objects in view, the invention comprises theimproved hydraulic apparatus as above characterized and the constructionand relative arrangement of the several parts, as will hereinafter bemore fully described, illustrated in the accompanying drawings andsubsequently incorporated in the subjoined claims.

In the drawings wherein I have disclosed one simple and practicalembodiment of the invention and in which similar reference charactersdesignate corresponding parts throughout the several views:

Figure 1 is a horizontal longitudinal section taken substantially on theline 1-! of Figure 2 and showing a preferred assembly of my presentimprovements;

15 Claims. (Cl. 103-443) Figure 2 is a vertical transverse section takensubstantially on the line 22 of Figure 1;

Figure 3 is a vertical longitudinal section of the outer casing takensubstantially on the line 3-3 of Figure 2;

Figure 4 is a developed interior plan View of the casing;

Figure 5 is a vertical sectional view of the chamber ring and divisionplate assembly;

Figure 6 is an inner side elevation of one of the chamber ring sections;

Figure 7 is a transverse sectional view taken on the line 1-! of Figure5;

Figure 8 is a detail plan view of the division plate;

Figure 9 is a side elevation of one of the rotor vanes; v

Figure 10 is an end view thereof on an enlarged scale.

Figure 11 is an outer side elevation of one rotor shaft bearing andhousing assembly;

Figure 12 is a detail elevation of one of the end covers for the outercasing;

Figure 13 is an inner side elevation of the bearing housing and sun gearassembly;

Figure 14 is a vertical sectional view taken substantially on the line Il-l4 of Figure 1;

Figure 15 is a side elevation of a modified form of rotor; and

Figure 16 is a section taken on line 16-16 of Figure 15.

For purposes of illustration, in the present instance I have shown myimprovements as applied to a hydraulic motor or pump of thedouble-acting type in which two intake and discharge phases occur ineach revolution of the rotor. However, it will be understood that manyof the novel features of the invention to be pres-, ently described areapplicable as well to a pump or motor of the single-acting typeQReferring for the present more particularly to Figures 2, 3 and 4 of thedrawings, the outer casing or housing structure [0 is of generalcylindrical form and provided with inlet and-outlet connections l2 and Mrespectively spaced degrees apart. The cylindrical wall of the casingmay be externally provided with spaced. pairs of mounting lugs or ribsl6 and I8 respectively having tapped bores, which may be rigidly securedto a supportingbase 2!] by suitable bolts 22 with the. inlet connectionl2 or outlet connection I4 disposed either vertically or horizontallywith relation to the casingbody.

The casing in is internally formed with opposite end flanges 24 andanintermediateweb or rib 26 which is circumferentially continuous anddirect communication with the respective inlet and outlet ports I2 and Il.

The liner sleeve 36 which provides the working chamber and allstationary and movable parts associated therewith are first assembledexternally of the casing Ill and then insertedas a unit to operativeposition therein. The liner sleeve 36 is of slightly less length thanthe casing II] and is centrally provided with inlet ports 38 spacedapart 180 degrees and with outlet ports 40 also spaced apart 180 degreesand located in predetermined spaced relation from the respective inletports. When the liner sleeve is mounted in the casing, these ports 38and 49 are in communication with the casing chambers 32 and 34respectively at relatively opposite sides of two diametrically opposedsections 38 of the rib which segregates the chambers 32 and 34 from eachother.

To an intermediate section of the rotor shaft 42, the rotor 44 isnon-rotatably connected by the key 46. rotor shaft receive snap rings 59to prevent axial displacement of the rotor relative to said shaft. Therotor 42 is formed with four cylindrical vane receiving openings 52spaced apart 90 degrees Circumferential grooves 48 in the which are onuniform diameter from end to end of the rotor. The rotor is furtherprovided intermediate of its ends with an annular fluid receivingchamber 54 which intersects the openings 52.

As seen in Figure 9 of the drawings, each of the rotor vanes comprisesacylindrical body portion 56 which is cut away on one side intermediateof its ends to form a recess or pocket 58 having an arcuately concavebottom surface 60. The Width of this vane pocket is substantially equalto the width of the annular chamber 54 in the rotor. The vane body 56 isprovided at each end with a coaxial diametrically reduced cylindricalextension 62 and 64 respectively which journal the vane in ball bearings56 of equal diameter to the vane body 56 mounted in opposite ends of theopening 52 in the rotor. The bearings are held against axial movement bythe snap rings 68 positioned at the outer sides of the bearings ingrooves formed in the wall of opening 52. The extension 64 at one end ofthe vane body 56 has a further cylindrical reduced axially projectingportion I0 which is formed with splines I2 one of which is accuratelycentered on the diameter which bisects the recess or pocket 58.

The splined portion I0 has a further reduced threaded terminal extension'14 to receive a retaining nut I6 for the vane driving gear or, pinionI8. This vane gear is internally splined to mate with the splines I2 andthe gear teeth are formed so that one tooth is in radial .alinement witha space between the internal splines so that the gear teeth will also beaccurately positioned relative to the recess or pocket 58.

As shown in Figures 1 and 14 of the drawings between the vane gears I8idler gears 80 are arranged. Each of these gears is fixed to a short 4shaft 82 journalled at one end in a roller bearing 84 mounted in arecess in one end of the rotor 44. These shafts at their other ends arejournalled in similar roller bearings 86 mounted in a cage member 88which is rigidly secured to one end of the rotor 44 by suitable screws,indicated at 90 in Figure 14 of the drawing.

Referring now to Figures 5 to 8 of the drawings, a chamber ring anddivision plate assembly is arranged in a relatively stationary positionwithin the annular chamber 54 of the rotor. In the present embodiment ofthe invention, the chamber ring consists of two substantiallysemi-circular sections 92 of equal diameter. Each of these ring sectionsis provided with openings 94 and 95 respectively which are adapted toregister with respective inlet and outlet ports in the opposite sides ofthe liner sleeve 36. Each ring section is further provided with internalkey-ways 98 extending from the openings 94 and 96 to the ends of thering section. As shown in Figure 7 of the drawing, between each openingin the ring section and the adjacent end thereof, a counterbored screwreceiving opening I60 is provided in intersecting relation to thekey-way 98. The large diameter section of this opening receives the headof an attaching screw I62 for a division plate I04, said screw headbearing upon the shoulders I06 formed by the small diameter section ofthe opening I00 at each side of the keyway 98.

Each division plate I04 is arcuately curved to provide inner and outersurfaces substantially concentric with the ring sections 92. The outersurface of the division plate is centrally formed with a longitudinallyextending key rib I08 for engagement in the key-ways 98 of adjoiningends of the two ring sections 92, and at each end thereof, is providedwith a tapped opening III) to receive the threaded shanks of theattaching screws I02, the heads of which are received in recesses H2 inthe key rib I08. Between the screw receiving openings I I I! in thedivision plate, said plate is centrally provided with a key receivingslot H4, in which a fiat metal key IIB has a driving fit and projectsoutwardly therefrom between the opposed ends of the ring sections 92 andin radially projecting relation to the outer circumference of said ringsections. As seen in Figure 2 of the drawings, these outwardlyprojecting portions of the two keys IIB are adapted to be fitted indiametrically opposite longitudinally extending internal key-ways II8formed in the wall of the liner sleeve 36. Thus the chamber ring and thedivision plates will be non-rotatably held in position with respect tothe liner 36. The outer edge faces of the chamber ring sections 92 forma running seal with the inner side walls of the rotor chamber 54 whilethe inner concave surfaces of the division plates I84 similarly form arunning seal with the bottom of the fluid receiving chamber 54 of therotor 44. The peripheral surfaces of the vanes 56; also have substantialfluid sealing contact with the. inner surfaces of ring sections 92'.

One end of the rotor shaft 42 is adapted to be journalled in a doubleroll ball. bearing 52!! mounted in a ring I22 having an external flangeI2 1 for abutting contact against one end of the liner sleeve 36. A sungear I26 is formed at one end of a sleeve I23 which loosely surroundsthe rotor shaft 42. The other end of the sleeve I28 is provided with anoutwardly extending annular flange I36 having a dowel pin I32 engaged inan opening I34 in the ring I22. The ring I22 and the sleeve flange I38are rigidly secured together by means of screws I36. It will be notedfrom reference to Figure 13 of the drawings that one of the teeth on thesun gear I26 is accurately centered on the same radius as the dowel pinI32.

The outer face of the ring I22 is recessed to receive the retainer ringI38 for the outer race of bearing I25 which is secured to said member bysuitable screws we while a retainernut I42 for the inner race of bearingI is threaded upon the reduced end of the rotor shaft 42.

As pointed out above, the splines 12 on vanes 58 are in predeterminedposition relative to the pockets 68, the teeth on the vane gears l8 arein predetermined position relative to the internal splines, and theteeth on the sun gear I26 are in predetermined position relative to thedowe1 pin opening I 34. This results in'simplicity'of manufacture ofeach individual part but does result in a cumulative error in thepositioning of the vanes '55 relative to the division plates I04 as therotor is rotated. It has been found preferable to thus simplify theindividual parts and to eliminate the accumulated error at one pointrather than to position the teeth, splines and dowel hole on each partso that no error is introduced. The accumulated error introduced byalining the teeth, splines and dowel hole as described above will varydepending upon the size of the unit, the number of gear or spline teethand other factors and in one embodiment of the invention amounts toapproximately three degrees, forty-nine minutes in the angular positionof the sun gear.

In order to eliminate this accumulated error, the ring I22 is providedwith a tapped hole I43 which is out of radial alinement with the dowelhole I32 by the amount of the accumulated error, which, in theembodiment mentioned, would be three degrees, forty-nine minutes.

A screw I46 having an enlarged head which projects outwardly from thering I22 is threaded into the tapped hole Hi3. For a purpose which willbe later described, the ring I22 is also provided with four tapped holes14d of the same size as the hole I43, two holes I45 being on each sideof the hole I43. tance from the center of the ring I 22 as the hole I43and the two holes I44 on each side of the hole I43 are spacedseventy-three degrees apart and seventy-three degrees from the hole I43.

A flanged cover I48 is provided for this end of the outer casing orhousing. The cover flange has a plurality of equi-distantly spacedopenings I50 to receive attaching screws I52 threaded into tapped boresI54 in the end of the casing wall. Preferably an annular gasket I56 ofsuitable material is interposed between the cover flange and the casingwall. The inner face of cover mnember its is provided, on the samediameter as the openings I43 and I44 in ring I22, with a plurality ofrecesses I58 which are circumferentially spaced apart 72 degrees, thepurpose of which will be presently explained in connection with thefinal assembly of several parts relative to the outer casing or housing.Preferably, an annulus of suitable packing material, indicated at I60,is also interposed between the inner face of cover member 548 and thebearing retaining ring I38.

The rotor shaft 42 is also journalled in a double row ball bearing I62mounted in a housing member I64 having an external flange I66 abuttingthe opposite end of liner sleeve 36. A spacing collar is interposedbetween the inner face of the bearing and the snap ring 50 on the rotorshaft as indicated at I68. The housing member The holes I 54 are thesame dis- I64 is provided with longitudinal key-ways I III to mate withthe ends of key-ways H8 in the sleeve 36 and receive the keys indicatedat I12. Member IE4 is further provided at diametrically opposits pointswith bores IE4 to receive the locate ing dowels I16 carried by the endcover member 78 for the casing I6, between which and the attachingflange of the cover member an annular gasket I88 is interposed. Thecover flange is provided with circumferentially spaced openings similarto those in cover member I48 to receive the attaching bolts I82 threadedinto the tapped bores I84 in the end of casing Ill.

As herein shown a flanged collar I86 is mounted in the cover member I18and loosely surrounds the rotor shaft 42. It is held against rotation bythe radial pin I 88 on the cover engaged ina slot in one end of saidcollar.. The collar I86 is surrounded by a fluid sealing ring I90p'ositioned'in an annular groove formedin cover member I18. Between theflanged end of collar I86 and the inner race of bearing I62, arotatingmechanical face type shaft'seal I92 is keyed to the shaft. Suitableseals are well known intheart. f

At the opposite end of the casing I6, between two of the bolt receivingbores I54, a dowel pin I4 is secured therein. Thispin is preferablylocated substantially mid-way between the inlet and outlet connectionsI2 and 'I4o f the casing and the projecting end thereof isadapted to bereceived in a cylindrical recess or bore I96 provided in the inner faceofthe attaching flange on cover member I48. As shown in Figure 12,

. one of the recesses I58 is in radial alinementwith the dowel hole I96.7

In assembling the above described parts, with respect to the outercasing or housing, the bearing i253 with ring I22 and sun gear I26 arefirst assembled on the end of the rotor shaft 42. After applying one ofthe stop rings 56 to shaft 42, the rotor 44 with case 88 and idler gearstherein is then mounted on the shaft'by means of key46 and the otherstop ring 50 applied to the shaft. The idler gears are thus positionedin the radial plane of sun gear I26 and in meshtherewith. M

The vanes 56 with their end bearings 6-6 are now inserted longitudinallyinto the openings 52 of the rotor. For the purpose of accurately establishing an initial position of the vane pocket 58 radially of therotor axis, each vane is preferably provided on its cylindrical surfaceat diametrically opposite sides thereof with longitudinally extendingcore lines or gauge marks 26!) which are circumferentially spaced apredetermined distance from the respective edges of the concave surface60-of the vane. First two ofthe vanes are inserted into diametricallyopposite openings 52 in the rotor with the gauge lines 206 on the Van-ein registration with the points of intersection of the circumferentialbase wall of chamber 54 with the opening 52 and with the pocket 58 inthe vane facing inwardly towards the axis of the rotor. A rotation isnow imparted to the rotor whereby idler gears 80 in mesh with therelatively stationary sun gear I26 and vane gears 18 will rotate the twovanes so that the pockets 58 thereof will open outwardly in. the chamber54. The other two vanes are then inserted with the gauge marks 200thereon registering with the points of intersection of the otheropenings 52 in the rotor with the circumferential surface o'f chamber54. It will of course be understood'tha'fi 7 in the insertion of eachvane to its applied position, the drive gear 18" therefor meshes withone of the idler gears 80.

The division plates I04 with keys II6 are now attached to relativelyopposite ends of the respective chamber ring sections 92 by one screwI82 and said ring sections then inserted from opposite sides of therotor into chamber 54 so that ends of the ring sections respectivelyopposing the ends of the ring section to which the division plates areattached will receive the key ribs I08 on the respective division platesand are then attached to said plates from the other screws I02. Thisrotor and division plate assembly is now inserted into the liner sleeve36 from one end thereof, the projecting portions of the keys II6 beingslidably fitted into the key-ways II8 of the sleeve wall. Thus, when theflange I24 on ring I22 abuts the end of sleeve 36 the rotor will beaxially positioned with the division plates I04 located between theinlet and outlet ports 38 and 40 of the liner sleeve 36 and Withopenings 94 and 96 in the chamber ring sections in accurate registrationwith the respective ports in said sleeve. The peripheral surface of thering I22 has a snu rotative fit within the end of the sleeve 36 forlimited adjustment of said. housing member and the sun gear I26 whencover member I48 is applied, as will be presently explained.

Spacing member I68 is now inserted over the rotor shaft, and bearing I62and its housing member I64, then inserted into the other end of theliner sleeve 36 with keys I12 locking said housing member to the sleeveagainst relative rotation. The rotating shaft seal member I92 is theninserted over end of shaft. When the cover member I18 isnow applied andits dowels I16 engaged in the bores I14 and secured to the end of thecasing by bolts I82, the sleeve and bearing housing are rigidly heldagainst rotative displacement relative to the casing.

The other end cover I48 for the casing is finally applied. Theprojecting end of dowel pin I914 is received in the bore I96 of thecover member while the head of screw of I46 is re ceived in a. recessI58 in said cover member. Thus as the cover member' I48 is moved to' itsfinal position'in which the dowel pin I94 willenter the: dowel hole I96;aslight rotativem'ovement will be imparted to. the ring I22 and sungear'l26 rotated through the same angle as the angle between dowel holeI34 and tapped hole- I4'3 in ring. I22.

Assembly of the cover I48 with the screw I46 in tapped hole I43 properlypositions the vanes 56 if all of the parts are wholly accurate; Ifhowever there are mechanical inaccuracieswhich afiecttimin-g so that thevanes 56 do not properly clear the division plates I04 theseinaccuracies can becompensated by removing the" screw I46 from the holeI 43 and placingit in one of the holes I44 where it will engage with acorresponding recess I58 in the cover I48. As pointed out above, theholes I44 are sp'acedseventy three deg-reesapart while the recesses I58are only seventy two degrees apart so that the four holes I44 permit twodegrees of adjustmentof the angular position of ring I22 and sungearI26'in each direction. If the sun gear I26 has twice as many teeth asthe vane gears 18, a two degree change'in the angular position of thesun gear I26 causes a" four degree change. in

he an ular position, of r the. vanes i 6 relative to 8 the rotor. Itwill of course be understoodthat screw I46 functions as a key torestrain ring I22 against any further rotative movement relative to theliner leeve from its adjusted position and to retain the sun gear I26 ina stationary or fixed position relative to the rotor shaft.

From the above description, it will be seen that unlike prior apparatusof this kind, the division plates are notsecured in fixed positionrelative to the working chamber but are slid-' ably keyed to the linersleeve 36. Thus, in the event of any slight axial play of the rotorshaft or axial displacement of the rotor relative to the shaft, thechamber ring sections and the attached division plates I04 will moveaxially as a unit therewith. In this manner, high frictional wear andexcessive resistance to rotation of the rotor is avoided and preciseaxial positioning of the rotor with respect to the di" vision plates inassembling is rendered unnecessary.

The construction of the rotor and chamber ring by which the chamber ringextends into the chamber formed in the rotor is an important feature ofthe invention since it results in face sealing between the rotor andchamber ring rather than edge sealing and also permits the use of largervane bearings. This simplifies and facilitates both manufacture andassembly of the apparatus.

While I prefer to make the rotor 44 of one piece and to make the chamberring 82 of two pieces so that the chamber ring can be mounted in thechamber 54, it is possible. to make the rotor of two pieces as shown inFigures 15 and 16. The chamber ring 92 may then be made as shown inFigures 5, 6 and '1 but need not be separated for assembly or may bemade of a single piece.

The rotor shown in Figures 15 and 16 comprises a body 2I8 having acentral bore 2 for receiving the shaft 42. The body 2H3 has a reducedportion 2'I3 and a fiat wall portion 2I4 extending radially from one endof the reduced portion 2 I3. A flat plate 2 I5 is secured to the body210 at the other end of the reduced portion H 3 by screws or bolts M6.The wall portion 2I4, reduced portion 213 and plate 2I5 form an annularfluid chamber identical in form with the fluid chamber 54.

While the plate 2 I 5 is'secured to the rotor body 2 I0, the vaneopenings 2 I1 and a keyway 2I8 are formed in the rotor body and plateassembly. The plate '2I5 may then be removed and the chamber ring anddivision plate assembly shown in Figure 5 may be placed in positionwithout being disassembled. The plate 2I5 is secured to the rotor body2I0'and the keyway 2I8 assures accurate alinement of the vaneopenings'in the plate and rotor body.

The liner sleeve 36 is maintained in a fixed axial position between theend cover members I48 and I18 for the outer casing While the dowels I16serve to accurately position the liner sleeve with its inlet and outletports 38 and'48 respectively located at relatively opposite sides of thelongitudinally extending portions '30 of the separating rib 26 betweentheinlet and outlet chambers 32 and 34 respectively of the casing I 6.Thus, it will be'understood, from reference'to' Figure 2 of the drawingsthat in each revolution of the rotor 44, each of the rotating vanes 58operates to twice transfer liquid in predetermined volume from the inletchamber 32 of the" casing I8 to the outlet present. improvements may bealso applied to a' single acting type of hydraulic apparatus, in whichthe use of only one division plate is required.

It will be appreciated that the present invention provides an hydraulicapparatus of this kind involving a minimum number of mechanical parts ofsimple structural form which may be expeditiously and accuratelyassembled for maximum operating efficiency without necessitating specialknowledge or unusual manual dexterity. While the mechanical principlesof the invention are illustrated by a selected embodiment thereof, inthe construction of apparatus of a required ca pacity designed for aparticular use, it may be found desirable to substitute parts ofsomewhat difierent structural form but having equivalent functionalcharacteristics of corresponding parts of the apparatus hereindescribed.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand not restrictive, the scope of the invention being indicated by theappended claims rather than by the foregoing description, and allchanges which come within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letter Patentis:

1. In hydraulic apparatus of the rotary type having a cylindrical wallforming a working chamber and circumferentially spaced inlet and outletports, a rotor mounted in said chamber having an annular peripheralchamber in fluid communication with said inlet and outlet ports and aplurality of circumferentially spaced cylindrical openings extendinglongitudinally through the rotor in intersecting relation to saidannular chamber, a relatively stationary division plate in said annularchamber between said ports, a sealing chamber ring fixed to saiddivision plate between opposite side walls of said annular rotor chamberand in running contact with the inner faces thereof, said chamber ringhaving spaced openings therein registering with said inlet and outletports respectively, a vane rotatably moun ed in each of said openings,and means for operating said vanes in timed relation to the rotation ofthe rotor comprising a sun gear, means mounting said gear in fixedco-axial position in the working chamber relative to said rotor, ahousing fixed to one end of the rotor, a plurality of idler gears inmesh with said sun gear each having a shaft journalled at opposite endsin said housing and rotor respectively, and a gear fixed to one end ofeach vane within said housing in meshed engagement with one of saididler gears 2. Hydraulic apparatus as defined in claim 1, together withadditional means for rotatably adjusting the sun gear to initiallyestablish a predetermined position of the vanes in the rotor foruninterrupted movement with and relative to the rotor over said divisionplate.

3. In hydraulic apparatus of the rotary type, a casing having fluidinlet and outlet connections, rotary mechanism mounted within saidcasing including a rotor having an annular peripheral chamber in fluidcommunication with said inlet and outlet connections and a plurality ofvanes rotatably mounted in the rotor in intersecting relation with saidchamber, a relatively stationary division plate in the rotor chamberbetween said inlet and outlet connections, and means for timing therotation of said vanes relative to rotation of the rotor fornon-interfering movement of the vanes over the division plate,comprising gearing operatively connected with the vanes and including arelatively stationary sun gear in co-axial relation with the rotor, anend cover for said casing, a member havin a fixed connection with saidsun gear, and said cover having means co-acting with said member inmovement of the cover to applied position relative to the casing torotatably adjust the position of the sun gear and initially establish apredetermined position of the vanes in the rotor.

4. Hydraulic apparatus as defined in claim 3, wherein a recess isprovided in said end cover and a dowel pin is fixed to the end of thecasing and engaged in. said recess to support and direct the cover toits applied position.

5. Hydraulic apparatus as defined in claim 3, together with a ring, abearing mounted in said ring, a supporting shaft for the rotorjournalled at one end in said bearing and means rigidly ccnnecting saidsun gear to said ring, and wherein said member is carried by said ringand coacts with the means on the cover to retain said sun gear and ringin a stationary position.

6. Hydraulic apparatus as defined in claim 5, in which said connectingmeans comprises an end flange on said sun gear and a dowel pinconnecting said end flange to said ring and located in radially centeredrelation to a tooth on said sun gear, and wherein said ring is providedwith a plurality of circumferentially spaced openings, said member beingengaged in one of said openings adjacent to the dowel pin but out ofradial alignment therewith) and the co-acting means on said covercomprises a plurality of recesses therein in different circumferentiallyspaced relation from the openings in said ring for selective engagementwith said member.

7. In hydraulic apparatus of the rotary type, an outer casing providedwith inlet and outlet connections, a unitary assembly axially insertablewithin said casing comprising a liner sleeve for the casing havingcircumferentially spaced inlet and outlet ports and an axialkeywayextending between said ports, a shaft having a rotor fixed theretoprovided with an annular peripheral chamber and a plurality of vanesmounted in said rotor and movable relative thereto, and a division platein said rotor chamber provided with a key slidable in said keyway in theaxial insertion of the shaft and rotor within said liner sleeve toposition said division plate between the inlet and outlet ports innon-rotatable relation to the rotor and said liner sleeve,

8. Hydraulic apparatus as defined in claim 7, wherein said assemblyfurther comprises bearing supporting housings for the rotor shaft,closing the opposite ends of said liner sleeve.

9. Hydraulic apparatus as defined in claim 8, together with operatingmeans for the rotor vanes including a stationary member fixed to one ofsaid bearing housings.

10. Hydraulic apparatus as defined in claim 7, wherein said assemblyfurther comprises a hearing supporting housing for the rotor shaft fixedat one end to the liner sleeve, and an end cover member for the outercasing having means to co-act with means on said housing andnon-rotatably position the liner sleeve in said casing with said inletand outlet ports thereof in fluid communication with the inlet andoutlet connections respectively of said casing.

11. In hydraulic apparatus of the rotary type, a casing having an inletport and an outlet port spaced from said inlet port a rotor having acentral hub portion and end plates extending outwardly from said hubportion to form an annular chamber, a chamber ring comprising twosemicircular ring sections disposed between said end plates and inrunning contact therewith, said chamber ring having an inlet port and anoutlet port spaced apart the same distance as the ports in said casing,a division plate connecting said semi-circular ring sections betweensaid inlet port and said outlet port, means for positioning the chamberring relative to the casing with the inlet openings and the outletopenings of the cas ing and chamber ring in alinement, and vanesrotatably mounted in said rotor within the annular chamber and means forrotating said vanes.

12. In a hydraulic mechanism of the rotary type, a rotor having anannular recess forming the bottom and sides of a fluid chamber, achamber ring comprising a pair of semi-circular ring sections extendinginto said recess in running sealing relationship with the sides of saidfluid chamber, a division plate connecting said semicircular ringsections and extending into said fluid chamber, said chamber ring havinga fluid inlet port on one side of said division plate and a fluid outletport .on the other side of said division plate,

and a plurality of vanes rotatably mounted inv said rotor and extendingacross said chamber.

13. In hydraulic mechanism of the rotary type, a housing having fluidinlet and fluid outlet means, a shaft rotatably mounted in said housing,a rotor fixed on said shaft, said rotor having an annular peripheralfluid chamber therein, a plurality of vanes rotatably mounted in saidrotor parallel to said shaft and extending across said chamber, achamber ring extending into said chamber, a division plate secured tosaid chamber ring within said chamber, said chamber ring having a fluidinlet opening on one side of said:

division plate and a fluid outlet opening on the other side of saiddivision plate, means for axially slidably securing said chamber ring insaid housing, means connecting the fluid inlet means of said housingwith the fluid inlet opening of the chamber ring and means connectingthe fluid outlet means of said housing with the fluid outlet opening ofsaid chamber ring.

14. In hydraulic apparatus of the rotary type having a cylindrical wallforming a working chamber and provided with circumferentially spacedinlet and outlet ports; a rotor mounted in said working chamber havingan annular peripheral chamber in fluid communication with said ports;vanes movably mounted .in said rotor to traverse said annular rotorchamber; a division plat in said annular rotor chamber; a pair ofsemi-circular sealing chamber ring sections flxed to said division platebetween the opposite side walls of said annular rotor chamber and inrunning contact with the inner faces thereof, said chamber ring sectionshaving spaced openings thereinregistering with said inlet and outletports respectively; and means non-rotatably connecting said divisionplate to the wall of said working chamber between the inlet and outletports for movement with said rotor axially of the working chamber.

15. In hydraulic apparatus of the double acting rotary type; a, cylinderproviding a working chamber with circumferentially spaced inlet andoutlet ports in opposite sides of the cylinder wall; a rotor mounted insaid chamber having an annular peripheral chamber in fluid communicationwith said ports and a plurality of relatively movable vanes mounted insaid rotor to traverse said annular chamber; a pair of division platesadapted to be assembled in the annular rotor chamber at diametricallyopposite sides of the rotor, said plates each having means slidablycoacting with means internally formed on the cylinder Wall in the axialmovement of the rotor to operative position within the cylinder toretain said division plates against circumferential displacementrelative to the cylinder wall and rotor while permitting axial unitarymovement of said plates with the rotor in the operative position of therotor; and a pair of stationary ring sections in the rotor chamber eachfixed at its 0pposite ends to the respective division plates and havingopenings therein registering with said inlet and outlet ports atopposite sides of the cylinder, said ring sections having running sealcontact with opposite side walls of the rotor chamber and the'rotorvanes.

WALTER H. MARSH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 19,772 Dudley Dec. 3, 1935298,952 Donkin May 20, 1884 1,279,913 Roberts Sept. 24, 1918 1,565,401Schaeren Dec. 15, 1925 1,743,977 Petersen Jan. 14, 1930 2,136,066Walters Nov. 8, 1938 2,202,911 Johnson June 4, 1940 2,274,206 Marsh Feb.24, 1942 2,296,768 Cochran Sept. 22, 1942 2,508,356 Allsup May 23, 1950FOREIGN PATENTS Number Country Date 83,755 Germany of 1895 219,902Germany Sept. 1907

